Aerobic treatment tank



FIG. 1 is an upper perspective view of a aerobic treatment tank showingmy deisgn.

FIG. 2 is a side elevational view thereof, the opposite side being amirror image thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is an opposite end view thereof; and,

FIG. 6 is a botom view thereof.

The broken line showing is for illustrative purposes only and forms nopart of the claimed design.

I claim the ornamental design for a aerobic treatment tank, as shown anddescribed.